Mineralogy Database

Tongbaite Mineral Data

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General Tongbaite Information

Help on Chemical  Formula: Chemical Formula: Cr3C2
Help on Composition: Composition: Molecular Weight = 180.01 gm
   Chromium  86.66 %  Cr
   Carbon    13.34 %  C
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cr3C2
Help on Environment: Environment: In ultramafic rocks.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Liu Zhuang, Tongbai County, Henan, China Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tongbaite + Pronunciation Say TONGBAITE
Help on Synonym: Synonym: ICSD 15086
  PDF 35-804

Tongbaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4856:1:0.2455
Help on Cell Dimensions: Cell Dimensions: a = 5.57, b = 11.47, c = 2.816, Z = 4; V = 179.91 Den(Calc)= 6.65
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.3(1), 2.23(0.8), 1.193(0.7),

Physical Properties of Tongbaite

Help on Color: Color: Light brownish yellow.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 8.5 - Chrysoberyl
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray

Optical Properties of Tongbaite

Help on Optical Data: Optical Data: Biaxial (?)
Help on RL Anisotrophism: RL Anisotrophism: Strong, purplish yellow to yellow-orange.
Help on RL Bireflectance: RL Bireflectance: Distinct.
Help on RL Color: RL Color: Pale violet.
Help on RL Pleochroism: RL Pleochroism: Distinct.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tongbaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 405 nm   46.54   49.10 
 436 nm   48.50   51.28 
 480 nm   51.14   53.86 
 526 nm   53.72   55.94 
 546 nm   54.68   56.89 
 578 nm   57.07   57.51 
 589 nm   57.38   57.82 
 622 nm   58.72   57.68 
 644 nm   60.33   59.02 
 656 nm   61.50   59.97 
 664 nm   61.56   59.97 
 700 nm   61.35   59.20 
Calculated Relative Intensity Colors of Tongbaite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180%

Calculated Properties of Tongbaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.21 gm/cc
note: Specific Gravity of Tongbaite =6.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PETongbaite = 19.96 barns/electron
U=PETongbaite x rElectron Density= 123.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tongbaite is Not Radioactive

Tongbaite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.01)with metallic elements other than the platinum group
  (01.01.17)Dana Group Tongbaite Cr3C2 P nma 2/m 2/m 2/m Florenskyite! (Fe,Ni)TiP P nma 2/m 2/m 2/m Andreyivanovite! FeCrP P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 01.BA.15 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
  01.B - Metallic Carbides, Silicides, Nitrides and Phosphides
  01.BA -Carbides
01.BA.15 Tongbaite Cr3C2 P nma 2/m 2/m 2/m

Other Tongbaite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Tongbaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 01.BA.15





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